STMicroelectronics

L9935 - 1A Dual H-Bridge Stepper Motor Driver | STMicroelectronics

Name: L9935
Brand: STMicroelectronics
Price: 2.19 USD
Availability: InStock

MPN: L9935 ✓ Active

In Stock Ships in 1-3 business days

5 V to 40 V Vdss 1 A Id 35 °C/W Rds(on) PowerSO-20 (20-SOIC, 0.433", 11.00mm Width) Exposed Pad Package

From $2.19 USD / Unit

MOQ: 1 |

Price updated: 2026-08-17

Volume Pricing

Qty	Unit Price	Extended
1	$3.42	$3.42
10	$3.08	$30.80
100	$2.74	$274.00
500	$2.46	$1,230.00
1,000	$2.19	$2,190.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for L9935 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

L9935_V01

✅ Drop-In

📦 PowerSO-20

Same package and pinout, variant of L9935

📋 Reference alternative (not in catalog)

L6201P

⚡ Same Package

📦 PowerSO-20

Dual full-bridge driver without SPI, different pinout

📋 Reference alternative (not in catalog)

L6234D

⚡ Same Package

📦 PowerSO-20

Triple half-bridge driver, different pinout

📋 Reference alternative (not in catalog)

L9935 Maximum Ratings & Electrical Characteristics

Motor Type	Bipolar Stepper
Output Current per Channel	1 A
Supply Voltage Range	5 V to 40 V
Number of Outputs	2 Full Bridges
Control Interface	SPI
Package	PowerSO-20 (20-SOIC, 0.433", 11.00mm Width) Exposed Pad
Mounting Type	Surface Mount
Operating Temperature Range	[DATA_NEEDED: Operating Temperature Range]
Thermal Resistance (junction-to-ambient)	35 °C/W
Saturation Voltage	1.2 V at 1 A
Rise/Fall Time	100 ns (typical)
Protection Features	Short-Circuit, Thermal Shutdown, Overload, Open Load, Overtemperature Pre-alarm
Standby Mode	Yes
Process Technology	BCD (Bipolar-CMOS-DMOS)
RoHS Status	Compliant

L9935 Pin Configuration

Pin 1	OUT1A — Output 1A - H-bridge 1 output
Pin 2	OUT1B — Output 1B - H-bridge 1 output
Pin 3	VS — Supply voltage
Pin 4	OUT2A — Output 2A - H-bridge 2 output
Pin 5	OUT2B — Output 2B - H-bridge 2 output
Pin 6	GND — Ground
Pin 7	SD — Shutdown input
Pin 8	CLK — Clock input for SPI
Pin 9	DATA — Data input for SPI
Pin 10	CS — Chip select for SPI
Pin 11	FLAG — Error flag output
Pin 12	VSS — Logic supply voltage

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

L9935 is suitable for 6 applications: Automotive Power Windows, Industrial Conveyor Belt Control, Robotic Actuators, Automotive Mirror Adjustment, 3D Printers, Medical Device Positioning.

🚗

Automotive Power Windows

The L9935 drives the DC motor for power windows, providing bidirectional control and protection. Its 1A output current and 5V-40V supply range make it suitable for 12V automotive systems. The integrated short-circuit protection and thermal shutdown ensure reliable operation in harsh environments. The SPI interface allows precise control of window position and speed.

Recommended

L9935 · STMicroelectronics STM32F103 (Microcontroller for SPI control)

🏭

Industrial Conveyor Belt Control

The L9935 drives the stepper motor in conveyor belt systems, providing precise position control and high reliability. Its 1A output current and integrated current regulation ensure smooth operation. The wide supply voltage range (5V-40V) allows use in 24V industrial systems. The error flag output provides diagnostic information for predictive maintenance.

Recommended

L9935 · STMicroelectronics STM32F407 (Microcontroller for motion control)

🤖

Robotic Actuators

The L9935 drives the stepper motors in robotic actuators, providing precise position and speed control. Its 1A output current and SPI interface enable smooth, coordinated motion. The integrated protection features prevent damage from overloads and short circuits. The compact PowerSO-20 package is ideal for space-constrained robot designs.

Recommended

L9935 · STMicroelectronics STM32F4 (Microcontroller for robot control)

🚗

Automotive Mirror Adjustment

The L9935 drives the DC motors for mirror adjustment, providing precise positioning and protection. Its 1A output current and 5V-40V supply range are suitable for 12V automotive systems. The SPI interface allows fine control of mirror position. The thermal shutdown feature prevents damage during prolonged operation.

Recommended

L9935 · STMicroelectronics STM32F0 (Microcontroller for mirror control)

🖨️

3D Printers

The L9935 drives the stepper motors in 3D printers, providing precise position control for the print head and build platform. Its 1A output current and integrated current regulation ensure smooth, accurate motion. The SPI interface allows fine control of motor speed and position. The compact package is ideal for space-constrained printer designs.

Recommended

L9935 · STMicroelectronics STM32F103 (Microcontroller for printer control)

💊

Medical Device Positioning

The L9935 drives the stepper motors in medical devices for precise positioning, such as in infusion pumps or diagnostic equipment. Its 1A output current and SPI interface enable accurate, repeatable motion. The integrated protection features ensure safe operation in medical environments. The wide supply voltage range allows use in various power systems.

Recommended

L9935 · STMicroelectronics STM32L4 (Low-power microcontroller for medical device)

Recommended Products Summary

L9935 STMicroelectronics Used in: Automotive Power Windows, Industrial Conveyor Belt Control, Robotic Actuators, Automotive Mirror Adjustment, 3D Printers, Medical Device Positioning STM32F103 Microcontroller for SPI control Used in: Automotive Power Windows, 3D Printers STM32F407 Microcontroller for motion control Used in: Industrial Conveyor Belt Control STM32F4 Microcontroller for robot control Used in: Robotic Actuators STM32F0 Microcontroller for mirror control Used in: Automotive Mirror Adjustment STM32L4 Low-power microcontroller for medical device Used in: Medical Device Positioning

What is the L9935?

The L9935 is a two-phase stepper motor driver circuit from STMicroelectronics, designed to drive bipolar stepper motors. It integrates two full-bridge drivers with a serial interface (SPI) and can deliver up to 1A continuous output current per channel, operating from a 5V to 40V supply.

What is the output current of the L9935?

The L9935 can deliver up to 1A continuous output current per channel. According to the STMicroelectronics datasheet, this makes it suitable for driving small to medium bipolar stepper motors in automotive and industrial applications.

What is the supply voltage range of the L9935?

The L9935 operates from a supply voltage range of 5V to 40V. This wide range allows it to be used in various automotive (e.g., 12V systems) and industrial (e.g., 24V systems) applications.

What package is the L9935 available in?

The L9935 is available in a PowerSO-20 package, which is a 20-pin SOIC (0.433", 11.00mm Width) with an exposed pad. This package provides good thermal performance for high-current applications.

Does the L9935 have short-circuit protection?

Yes, the L9935 features short-circuit protection on all outputs. According to the STMicroelectronics datasheet, it also includes an error flag for overload, open load, and overtemperature pre-alarm conditions.

Can the L9935 be used for automotive applications?

Yes, the L9935 is designed for automotive applications such as power windows, mirrors, and seat adjustment. Its wide supply voltage range (5V to 40V) and robust protection features make it suitable for harsh automotive environments.

What is the difference between the L9935 and L6201P?

The L9935 is a two-phase stepper motor driver with SPI control, while the L6201P is a dual full-bridge driver without SPI. The L9935 offers integrated chopping current regulation and controlled output voltage slopes, which are not present in the L6201P. The L9935 is more suitable for stepper motor applications requiring precise current control.

What is the difference between the L9935 and L6234D?

The L9935 is a two-phase stepper motor driver with SPI control, while the L6234D is a triple half-bridge driver. The L9935 is specifically designed for bipolar stepper motors, whereas the L6234D is more general-purpose for three-phase brushless DC motors. The L9935 also has a higher output current capability (1A vs 1.4A peak for L6234D).

When should I choose the L9935 over the L6201P?

Choose the L9935 when you need a stepper motor driver with SPI control and integrated current regulation. The L9935 is better suited for applications requiring precise current control and reduced electromagnetic radiation. Choose the L6201P if you need a simpler dual full-bridge driver without SPI and are willing to implement external current sensing.

What is the best drop-in replacement for the L9935?

The best drop-in replacement for the L9935 is the L9935_V01, which is a variant from STMicroelectronics with the same package and pinout. Other potential drop-in replacements include the L6201P and L6234D, but these have different pinouts and may require PCB modifications. Always verify pin compatibility before replacing.

Can the L6201P replace the L9935?

The L6201P is not a direct drop-in replacement for the L9935 because it has a different pinout and lacks SPI control. While both are dual full-bridge drivers, the L6201P requires external current sensing and does not have the integrated chopping current regulation of the L9935. PCB modifications would be required.

Where to buy the L9935 online?

The L9935 is available from major distributors such as DigiKey, Mouser, and Octopart. As of 2026-08-14, DigiKey lists the L9935 in stock with pricing starting at $3.42 for single-unit quantities. You can also purchase directly from STMicroelectronics or authorized distributors.

What is the price of the L9935?

As of 2026-08-14, the L9935 is priced at $3.42 for a single unit, $3.08 for 10 units, $2.74 for 100 units, $2.46 for 500 units, and $2.19 for 1000 units, based on DigiKey pricing. Prices may vary by distributor and quantity.

What is the lead time for the L9935?

The lead time for the L9935 varies by distributor and stock availability. As of 2026-08-14, DigiKey shows the L9935 in stock and ready to ship. For larger quantities, lead times may be 4-8 weeks depending on the distributor and region.

Is the L9935 in stock?

As of 2026-08-14, the L9935 is in stock at DigiKey and other major distributors. Heisener.com also reports 226,620 pieces in stock. Availability may change, so check with your preferred distributor for real-time inventory.

Where to download the L9935 datasheet PDF?

The L9935 datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/l9935.pdf. It is also available from third-party sites like Alldatasheet and Octopart.

Where to find the L9935 pinout?

The L9935 pinout is detailed in the official STMicroelectronics datasheet, which can be downloaded from https://www.st.com/resource/en/datasheet/l9935.pdf. The pinout diagram is also available on distributor pages like DigiKey and Octopart.

What are the key specifications of the L9935 that engineers should know?

The L9935 is a two-phase stepper motor driver with a 5V to 40V supply range, 1A continuous output current per channel, and SPI control. It features integrated chopping current regulation, short-circuit protection, and controlled output voltage slopes to reduce EMI. The device is packaged in a PowerSO-20 with an exposed pad for thermal management.

Hey Google, what can replace the L9935?

The L9935 can be replaced by the L9935_V01, which is a variant from STMicroelectronics with the same package and pinout. Other potential replacements include the L6201P and L6234D, but these have different pinouts and may require PCB modifications. Always verify pin compatibility before replacing.

Is the L9935 the same as the L6201P?

No, the L9935 and L6201P are not the same. The L9935 is a two-phase stepper motor driver with SPI control and integrated current regulation, while the L6201P is a dual full-bridge driver without SPI. They have different pinouts and are not drop-in compatible.

What is the best STMicroelectronics equivalent for the L9935?

The best STMicroelectronics equivalent for the L9935 is the L9935_V01, which is a variant with the same package and pinout. Other STMicroelectronics parts like the L6201P and L6234D are functionally similar but have different pinouts and may require PCB modifications.

Engineering reference data for L9935 — comparison, design guidance, and compliance information.

Selection Guide

Choose the L9935 when you need a two-phase stepper motor driver with SPI control and integrated current regulation. It is ideal for automotive and industrial applications requiring precise position control and low EMI. Choose the L9935_V01 if you need a variant with the same package and pinout. Choose the L6201P if you need a simpler dual full-bridge driver without SPI and are willing to implement external current sensing. Choose the L6234D if you need a triple half-bridge driver for three-phase brushless DC motors. All alternatives share the PowerSO-20 package, but only the L9935_V01 is a true drop-in replacement.

Comparison with Alternatives

Parameter	This Product	L9935_V01	L6201P	L6234D
Package	PowerSO-20	PowerSO-20	PowerSO-20	PowerSO-20
Brand	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Output Current per Channel	1 A	1 A	1 A	1.4 A (peak)
Supply Voltage Range	5 V to 40 V	5 V to 40 V	12 V to 48 V	7 V to 52 V
Control Interface	SPI	SPI	Parallel	Parallel
Number of Outputs	2 Full Bridges	2 Full Bridges	2 Full Bridges	3 Half Bridges
Integrated Current Regulation	Yes	Yes	No	No
Short-Circuit Protection	Yes	Yes	Yes	Yes

Key Differentiators

Integrated chopping current regulation (vs L6201P)
SPI control interface (vs L6201P)
Controlled output voltage slopes (vs L6234D)

Design Notes

The L9935 in PowerSO-20 package has a thermal resistance of 35°C/W. At 1A output current and 12V supply, power dissipation can be significant. Ensure adequate PCB copper area and consider a heatsink for high ambient temperature applications. The exposed pad should be soldered to a large copper pour for optimal heat transfer.

Place decoupling capacitors (100nF and 10uF) close to the VS and VSS pins to filter noise and prevent voltage spikes. Use a ground plane to minimize EMI. The controlled output voltage slopes of the L9935 help reduce electromagnetic radiation, but proper layout is still essential for compliance with EMC standards.

After waking from standby mode, the SPI interface must be re-initialized. Ensure the microcontroller firmware handles this correctly. Also, verify that the supply voltage does not exceed the absolute maximum rating of 40V, as transients in automotive systems can cause damage. Use a TVS diode for protection.